is set to [2].
Web/EMS: ISDN Overlap
IP to Tel Dialing
CLI: isdn-tx-overlap
[ISDNTxOverlap]
Enables ISDN overlap dialing for IP-to-Tel calls. This feature is part of
ISDN-to-SIP overlap dialing according to RFC 3578.
[0] Disable (default)
[1] Enable
When enabled, for each received INVITE of the same dialog session,
the device sends an ISDN Setup (and subsequent ISDN Info Q.931
messages) with the collected digits to the Tel side. For all subsequent
INVITEs received, the device sends a SIP 484 Address Incomplete
response in order to maintain the current dialog session and receive
additional digits from subsequent INVITEs.
Note: When IP-to-Tel overlap dialing is enabled, to send ISDN Setup
messages without the Sending Complete IE, the ISDNOutCallsBehavior
parameter must be set to USER SENDING COMPLETE (2).
Web: Enable Receiving
of Overlap Dialing
CLI: ovrlp-rcving-type
[ISDNRxOverlap_x]
Determines the receiving (Rx) type of ISDN overlap dialing for Tel-to-IP
calls, per trunk.
[0] None = (Default) Disabled.
[1] Local receiving = ISDN Overlap Dialing - the complete number is
sent in the INVITE Request-URI user part. The device receives ISDN
called number that is sent in the 'Overlap' mode. The ISDN Setup
message is sent to IP only after the number (including the Sending
Complete IE) is fully received (via Setup and/or subsequent Info
Q.931 messages). In other words, the device waits until it has
received all the ISDN signaling messages containing parts of the
called number, and only then it sends a SIP INVITE with the entire
called number in the Request-URI.
[2] Through SIP = Interworking of ISDN Overlap Dialing to SIP,
based on RFC 3578. The device interworks ISDN to SIP by sending
digits each time they are received (from Setup and subsequent Info
Q.931 messages) to the IP, using subsequent SIP INVITE
messages.
Notes:
When option [2] is configured, you can define the minimum number
of overlap digits to collect before sending the first SIP message for
routing the call, using the MinOverlapDigitsForRouting parameter.
When option [2] is configured, even if SIP 4xx responses are
received during this ISDN overlap receiving, the device does not
release the call.
The MaxDigits parameter can be used to limit the length of the
collected number for ISDN overlap dialing (if Sending Complete is
not received).
If a digit map pattern is defined (using the DigitMapping or
DialPlanIndex parameters), the device collects digits until a match is
found (e.g., for closed numbering schemes) or until a timer expires
(e.g., for open numbering schemes). If a match is found (or the timer
expires), the digit collection process is terminated even if Sending
Complete is not received.
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